<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <script src="vue.js"></script>
</head>
<body>
  <div id="app1">app1: {{title}}</div>
  <div id="app2">app2: {{title}}</div>
  <script>
    var Vue2 = Vue.extend({
      data () {
        return { title: 'hello' }
      }
    })
    var vm1 = new Vue(
      { el: '#app1' }
    )
    var vm2 = new Vue2({ el: '#app2' })
 </script>
</body>
</html>